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Electric heating coil
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Issue date Nov 19, 1985
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Ultra-Temp Corporation
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Roy C. Lueth
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C21 - METALLURGY OF IRON
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3539100
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Issue date Nov 10, 1970
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F27 - FURNACES KILNS OVENS RETORTS
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2632234
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F27 - FURNACES KILNS OVENS RETORTS
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2287740
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Patent number 2,287,740
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F27 - FURNACES KILNS OVENS RETORTS
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2189143
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Patent number 2,189,143
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Issue date Feb 6, 1940
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F27 - FURNACES KILNS OVENS RETORTS
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2182202
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Patent number 2,182,202
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Issue date Dec 5, 1939
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F27 - FURNACES KILNS OVENS RETORTS
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2172376
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Patent number 2,172,376
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Issue date Sep 12, 1939
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F27 - FURNACES KILNS OVENS RETORTS
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2172379
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Patent number 2,172,379
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Issue date Sep 12, 1939
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F27 - FURNACES KILNS OVENS RETORTS
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2172378
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Patent number 2,172,378
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Issue date Sep 12, 1939
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F27 - FURNACES KILNS OVENS RETORTS
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2172380
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Patent number 2,172,380
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Issue date Sep 12, 1939
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F27 - FURNACES KILNS OVENS RETORTS
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2172377
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Patent number 2,172,377
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Issue date Sep 12, 1939
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F27 - FURNACES KILNS OVENS RETORTS
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2172381
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Patent number 2,172,381
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Issue date Sep 12, 1939
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F27 - FURNACES KILNS OVENS RETORTS
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2167640
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Patent number 2,167,640
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Issue date Aug 1, 1939
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F27 - FURNACES KILNS OVENS RETORTS
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2158865
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Patent number 2,158,865
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Issue date May 16, 1939
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F27 - FURNACES KILNS OVENS RETORTS
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1842981
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Issue date Jan 26, 1932
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F27 - FURNACES KILNS OVENS RETORTS
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1741624
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Issue date Dec 31, 1929
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F27 - FURNACES KILNS OVENS RETORTS
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1693870
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Patent number 1,693,870
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F27 - FURNACES KILNS OVENS RETORTS
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1332168
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Patent number 1,332,168
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Issue date Feb 24, 1920
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F27 - FURNACES KILNS OVENS RETORTS